Hematogenous pyogenic facet joint infection

STUDY DESIGN

Retrospective.

OBJECTIVES

To determine the incidence, clinical presentation, diagnostic laboratory values, imaging characteristics, and optimal treatment of hematogenous pyogenic facet joint infections.

SUMMARY OF BACKGROUND DATA

There are 27 documented cases of hematogenous pyogenic facet joint infections. Data regarding incidence, clinical presentation, diagnosis, and treatment response are incomplete because of the paucity of reported cases.

METHODS

This is a retrospective study of all cases of hematogenous pyogenic facet joint infection treated at one institution. Data from previous publications were combined with the present series to identify pertinent clinical characteristics and response to treatment.

RESULTS

A total of six cases (4%) of hematogenous pyogenic facet joint infection were identified of 140 cases of hematogenous pyogenic spinal infection at our institution. Combining all reported cases reveals the following: The average patient age is 55 years. Ninety-seven percent of cases occur in the lumbar spine. Epidural abscess formation complicates 25% of the cases of which 38% develop severe neurologic deficit. Erythrocyte sedimentation rate and C-reactive protein are elevated in all cases. Staphylococcus aureus is the most common infecting organism. Magnetic resonance imaging is accurate in identifying the septic joint and associated abscess formation. Percutaneous drainage of the involved joint has a higher rate of success (85%) than treatment with antibiotics alone (71%), but the difference is not significant (P = 0.37).

CONCLUSIONS

Hematogenous pyogenic facet joint infection is a rare but underdiagnosed clinical entity. Facet joint infections may be complicated by abscess formation in the epidural space or in the paraspinal muscles. Uncomplicated cases treated with percutaneous drainage and antibiotics may fare better than those treated with antibiotics alone. Cases complicated by an epidural abscess and severe neurologic deficit should undergo immediate decompressive laminectomy.

Projectile cylinder accidents resulting from the presence of ferromagnetic nitrous oxide or oxygen tanks in the MR suite

OBJECTIVE

The purpose of this study is to alert MR users to the potentially lethal consequences of projectile cylinder accidents in the MR environment.

CONCLUSION

Projectile cylinder tank accidents still occur and may be increasing, despite adherence to screening policies before MR imaging and safety education of hospital personnel. Four of the last five accidents at our institutions occurred within the past 3 years.

Traumatic atlanto-occipital dislocation: MRI and CT

CT and MRI were employed to help characterize an atlanto-occipital dislocation injury, providing useful information for planning surgical stabilization and directing rehabilitation.

Pyogenic spondylodiskitis: a radiologic/pathologic and culture correlation study

BACKGROUND

Intervertebral disk tissue is resistant to hematogenous infection because of its avascularity. However, spondylodiskitis is being diagnosed with increasing frequency because of advancement in magnetic resonance imaging technology. There is a dearth of information regarding the bacteriology, histomorphologic features, and radiopathologic correlation of spondylodiskitis.

DESIGN

The study population consisted of 20 patients diagnosed as having spondylodiskitis by magnetic resonance imaging with and without gadolinium 67 enhancement and bone scans with technetium Tc 99m or gallium citrate Ga 67. Twenty-seven biopsy and debridement specimens were obtained from these patients. The specimens were cultured for microorganisms and also processed for histopathologic testing. Tissue sections were examined with hematoxylin-eosin and stains for infectious agents (Gomori's methenamine-silver, Gram, and Ziehl-Neelsen stains).

RESULTS

Where intervertebral disk tissue was present (23 of 27 cases), the morphologic changes included vascularization (with or without granulation tissue), myxoid degeneration, and necrosis. Chronic osteomyelitis was present in all 27 specimens and was associated with acute osteomyelitis in 7 cases (25%). Twenty-one of 27 cases had positive culture results (mostly pyogenic bacteria), but special stains revealed microorganisms in sections of the disk in only 4 cases (3 cases with gram-positive cocci and 1 with yeast consistent with Blastomyces). Florid acute inflammation was present in all the 4 cases.

CONCLUSION

Histopathologic features of acute spondylodiskitis include vascular proliferation, myxoid degeneration, and necrosis of the disk tissue with adjacent chronic osteomyelitis. Acute inflammation is variable and when florid is usually associated with identifiable organisms on histologic examination. At biopsy, tissue should be submitted for culture, since culture has a high sensitivity and specificity for detecting the etiologic organism.

Percutaneous transpedicular discectomy and drainage in pyogenic spondylodiscitis

Spondylodiscitis normally heals itself, but it can cause bone destruction leading to deformity and often pain. Debridement of these infections by percutaneous transpedicular discectomy with access from adjacent caudal pedicles can accelerate natural healing and prevent progression to bone destruction and deformity. We outline this technique and discuss a series of 28 patients treated using a percutaneous transpedicular approach to obtain culture and histopathology specimens, permit drainage and antibiotic irrigation, and provide a channel for granulation tissue to invade the infected space. This procedure is safe and effective, but it is contraindicated for epidural abscess or granulation tissue-induced neurocompression and it is ineffective against extensive bone destruction.

Portal venous thrombosis: percutaneous therapy and outcome

PURPOSE

To study the efficacy of percutaneous treatment for portal vein thrombosis (PVT).

MATERIALS AND METHODS

Of 20 patients who were evaluated for symptomatic portal occlusion, 14 were successfully treated with use of percutaneous techniques. In patients with noncavernomatous PVT (n = 15), the initial treatment was to increase portal output by creating a transjugular intrahepatic portosystemic shunt (TIPS), which was successful in 12 cases. Methods to decrease arterial input to the portal system (hepatosplenic arterial embolization) were used as primary therapy in two patients and in an additional two patients with continued symptoms, despite a functioning TIPS.

RESULTS

All TIPS survivors had patent shunts, although patients with complete PVT required more frequent revisions compared to patients with nonocclusive PVT. Hepatosplenic arterial embolization controlled symptoms in the four patients who were treated, but both patients with patent TIPS died of liver failure after embolization. Of the 14 patients treated, eight died at a mean of 6.2 months (six from hepatoma).

CONCLUSION

TIPS is effective in patients with noncavernomatous PVT, although patients with complete thrombosis experience recurrent shunt occlusions and also may develop hepatoma. If TIPS fails, or if symptoms recur, hepatosplenic arterial embolization may be an option.

Percutaneous transpedicular management of discitis

PURPOSE

To present the technique of percutaneous transpedicular biopsy and debridement of discs in diagnosis and management of discitis.

MATERIALS AND METHODS

Fifteen patients underwent disc biopsy through a transpedicular approach with local anesthesia and fluoroscopic guidance. An attempt was made to debride the disc as much as possible. A surgical vacuum drain was deployed through the transpedicular tract when there was persistent drainage.

RESULTS

Fifteen patients underwent percutaneous transpedicular disc biopsy and debridement of disc for suspected discitis. Three patients underwent biopsy only and 12 underwent percutaneous discectomy. Six patients had at least one positive culture. Eight patients who underwent discectomy had immediate improvement of pain or neurologic symptoms, obviating emergency surgical debridement of the disc. Four patients did not improve and underwent surgical debridement and fusion.

CONCLUSIONS

Transpedicular biopsy of the disc is an effective technique for adequate tissue retrieval and diagnosis of discitis. Adequate debridement in selected patients with antibiotic therapy may be definitive. Epidural extension of discitis and massive vertebral destruction precludes percutaneous treatment.

Percutaneous tamponade of inadvertent transthoracic catheterization of the aorta

During routine placement of a subclavian central venous catheter for cancer chemotherapy, a sheath was inadvertently placed into the aortic arch, through the left lung. We describe a technique for transthoracic compression of the aortic injury using the sheath in conjunction with an occlusion balloon catheter.

CT of the spine: value of reformatted images

Recent improvements in CT software allow rapid and high-quality two-dimensional reformatting of scans of the spine. Reformatting involves computer interpolation of two-dimensional multislice images acquired during routine axial CT scanning in order to generate a three-dimensional volume of data. From this block of data, new images are created and displayed in any desired plane. Reformatted images are acquired within minutes following axial CT scanning.

Halifax interlaminar clamp for posterior cervical fusion: a long-term follow-up review

Fifty consecutive patients requiring posterior cervical fusion for various pathologies were treated with Halifax interlaminar clamps for internal spinal fixation. Fusion involved the C1-2 level in 17 cases, the C1-3 level in one, and the lower cervical area (C2-7) in 32. No patient was lost to follow-up review, which varied from 6 to 40 months (average 21 months). Fusion failed in five patients, three at the C1-2 level, one at the C1-3 level, and one at the C2-3 level. Screw loosening was the cause of failure in four patients, and in one the arch of C-1 fractured. No other complications occurred. Because of the lack of complications, avoidance of the hazards of sublaminar instrumentation, and an excellent fusion rate, this technique is highly recommended for posterior cervical fusion in the lower cervical spine. Atlantoaxial arthrodesis was achieved in only 14 (82%) of 17 patients, however, which might be due to the higher mobility at this multiaxial level. Improved results in this region may be possible by using a new modified interlaminar clamp, by performing adequate bone fusions, and by postoperative external halo immobilization in high-risk patients.

MR imaging of clival and paraclival lesions

A wide spectrum of diseases involve the clivus and paraclival structures. Primary neoplasms, metastatic tumors, and inflammatory, vascular, and hematopoietic disorders are the most common abnormalities to arise from or directly involve the clivus. MR imaging exquisitely shows and helps characterize the diseases that affect this area. Sagittal and coronal MR imaging allows precise localization and evaluation of the signal characteristics of a mass, enabling a more specific diagnosis. The multiplanar capabilities of MR imaging provide superb visualization of the adjacent cranial nerves and vascular structures, aiding in surgical planning and radiation therapy. In this pictorial essay, the MR imaging, CT, and conventional radiographic findings of various clival and paraclival lesions are illustrated.

Massive epistaxis due to pseudoaneurysm. Treated with detachable balloons

A case of massive epistaxis refractory to nasal packing and bilateral surgical ligation of the internal maxillary and ethmoidal arteries is presented. Angiography revealed a pseudoaneurysm of the cervical portion of the internal carotid artery, and intravascular detachable balloons were used for epistaxis control. The appropriate use of intravascular diagnostic and therapeutic techniques is described.

Squamous cell carcinoma of the maxillary sinus and palate in epidermolysis bullosa: CT demonstration

Extracutaneous squamous cell carcinoma is an unusual complication of epidermolysis bullosa (EB). We present a patient with long-standing EB who developed squamous cell carcinoma involving the palate and the maxillary sinus, and we describe the findings on CT.

Use of MR imaging-compatible Halifax interlaminar clamps for posterior cervical fusion

Twenty-one patients requiring posterior cervical fusion were treated with magnetic resonance (MR) imaging-compatible Halifax interlaminar clamps for internal fixation. Various levels were involved: the C1-2 level in eight cases, the C4-5 level in four, the C5-6 level in three, the C6-7 level in three, the C4-6 level in two, and the C5-7 level in one. Bilateral clamps were used in 18 cases and unilateral clamps in three. Autogenous iliac bone grafting was performed in all cases but one. Follow-up periods ranged from 1 to 18 months (average 9.2 months), with no complications or mechanical failures occurring thus far. Follow-up diagnostic studies revealed rigid fixation and fusion in all cases. The MR imaging-compatibility of the clamps allowed excellent follow-up studies with minimal artifact. Because of their ease of use, rigid stabilization, good results, lack of complications, and compatibility with MR imaging, the Halifax interlaminar clamp with bone grafting provides an ideal method for posterior cervical stabilization.